Flat Rolling Analysis Concepts

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In flat rolling analysis, what does the coefficient of friction depend on?

Rolling speed and work material

Lubrication, work material, and working temperature (correct)

Final velocity and roll speed

Roll radius and lubrication

What is the formula to calculate the flow stress (σf) based on true strain (ε) in rolling?

σf = kεn

σf = nε / (1 + k)

σf = kεn / (1 + n) (correct)

σf = k / (1 + nε)

What is a characteristic condition of hot rolling known as sticking?

The final velocity increases significantly

The rolls stop moving

The hot work surface adheres to the rolls (correct)

The deformation decreases

Where is the peak pressure typically located in flat rolling along the contact length?

At the neutral point Signup and view all the answers

What is the term used to describe the sequence in impression-die forging that causes flash to form in the gap between die plates?

Compression Signup and view all the answers

In flashless forging, what occurs just before the initial contact with the workpiece?

Partial compression Signup and view all the answers

What is a key requirement for both conventional and precision forgings after the initial forging process?

Flash trimming Signup and view all the answers

Which type of forging hammer operates based on gravity for the drop mechanism?

Gravity drop hammer Signup and view all the answers

What is the purpose of upsetting in forging?

To form a head on a bolt or similar hardware item Signup and view all the answers

What is the main characteristic of swaging in forging?

Reducing the diameter of solid rod stock Signup and view all the answers

In radial forging, how do the dies and workpiece move?

The dies remain fixed while the workpiece rotates Signup and view all the answers

What is roll forging primarily used for?

Tapering a tube Signup and view all the answers

What is the purpose of annealing in the preparation steps for continuous drawing of wire?

To increase the ductility of the material Signup and view all the answers

What defect in extruded products is characterized by a centerburst?

Center cracking Signup and view all the answers

In wire and bar drawing, what is the purpose of prelubrication after cleaning?

To prevent damage of the product and die Signup and view all the answers

What type of extrusion involves a combination of forward and backward motion?

Impact extrusion Signup and view all the answers

What is the formula to calculate the rolling force?

F = 175.7 × 300 × 27.4 Signup and view all the answers

How is the torque required to drive each roll calculated?

T = 0.5 × 1,444,786 × 27.4 Signup and view all the answers

What is the power, in Watts, required for the rolling process?

207,201 N.m/s Signup and view all the answers

How can rolling force and power be reduced in the rolling process?

Increasing the draft in each pass Signup and view all the answers

What is the primary purpose of using ring rolling in a manufacturing process?

To increase wall thickness of a ring Signup and view all the answers

In open-die forging, what does 'barreling' typically refer to?

A deformation where the workpiece narrows towards one end Signup and view all the answers